电子海图中不同基准纬度海图墨卡托坐标转换

Mercator coordination transform between different standard parallel in ECDIS

海图的显示速度是电子海图显示与信息系统中的一个重要性能指标,在系统的设计与开发中均应采取有效的方法来提高这一指标.为此,分析了不同基准纬度海图墨卡托坐标的转换,指出该转换的实质为一线性变换,讨论了算法中墨卡托坐标变换的时间复杂度,并据此提出了旨在提高海图显示速度的海图数据存储与转换方案(算法),从而大大提高了电子海图显示中坐标变换这一环节的速度.

Chart display speed is a very important performance figure in ECDIS. Hence, during the design and development of the ECDIS, programmers should find out efficient algorithms to improve it. In this paper, we analyze different algorithms of Mercator Coordination Transform between Different Standard Parallel and find that the core of the transform is a linear. We discuss about the time complexity of the transform and then bring forward an efficient way for chart data store and coordination transform algorithm. In our application, it is proved that this algorithm can improve coordinator transform speed prominently..